Hyperlite Mountain Gear Southwest 55 vs Six Moon Designs Swift X
Weight and specs compared for 2026 — and which one to choose.
Ultralight Dyneema 55L pack for serious gram-counters.
Highly configurable 50L ultralight pack with removable stay, hip belt and vest harness options to dial in fit and weight.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
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Hyperlite Mountain Gear Southwest 55 vs Six Moon Designs Swift X: which should you buy?
If saving weight is your priority, the Hyperlite Mountain Gear Southwest 55 wins — at 680 g it is 85 g (11%) lighter than the Six Moon Designs Swift X (765 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.
See where both rank against everything else in this category on the lightest backpack page, or browse the full gear weight database.